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0.26r+0.18r=-3.08
We move all terms to the left:
0.26r+0.18r-(-3.08)=0
We add all the numbers together, and all the variables
0.44r+3.08=0
We move all terms containing r to the left, all other terms to the right
0.44r=-3.08
r=-3.08/0.44
r=-7
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